CN111357191A - Motor control device, electric compressor provided with same, air conditioner for moving body, motor control method, and motor control program - Google Patents
Motor control device, electric compressor provided with same, air conditioner for moving body, motor control method, and motor control program Download PDFInfo
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- CN111357191A CN111357191A CN201880069379.8A CN201880069379A CN111357191A CN 111357191 A CN111357191 A CN 111357191A CN 201880069379 A CN201880069379 A CN 201880069379A CN 111357191 A CN111357191 A CN 111357191A
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- 238000000034 method Methods 0.000 title claims description 25
- 238000005259 measurement Methods 0.000 abstract description 16
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/02—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for optimising the efficiency at low load
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00421—Driving arrangements for parts of a vehicle air-conditioning
- B60H1/00428—Driving arrangements for parts of a vehicle air-conditioning electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/03—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for very low speeds
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/20—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors for controlling one motor used for different sequential operations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention provides a motor control device, comprising: a control unit that controls the rotation speed of the motor in accordance with the required rotation speed by performing a 1 st control capable of performing high-torque and precise control on the motor or a 2 nd control capable of performing control on the motor with higher efficiency than the 1 st control; and a switching determination unit that switches from the 1 st control to the 2 nd control when the measured value of the rotation speed of the motor exceeds a predetermined rotation speed threshold value. The switching determination unit further switches from the 1 st control to the 2 nd control when the actual rotation speed measurement value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a time point at which the actual rotation speed measurement value coincides with the required rotation speed.
Description
Technical Field
The present invention relates to a motor control device, an electric compressor provided with the motor control device, an air conditioner for a mobile body, a motor control method, and a motor control program.
The present application claims priority based on japanese application patent No. 2017-222638 filed on japanese application on 11/20/2017, and the contents thereof are incorporated herein by reference.
Background
One of the components of an in-vehicle air conditioner mounted on a vehicle is an electric compressor. Generally, a motor of an electric compressor is driven by ac power whose voltage and frequency are regulated by an inverter functioning as a transmission. Therefore, in order to appropriately control the electric compressor, it is necessary to appropriately control the inverter in accordance with a change in the operation request at the time of or after the start, a fluctuation in the load, and the like.
Patent document 1 describes two motor control methods, a control method in which the accuracy of estimating the position of the magnet rotor is prioritized and a control method in which silence is prioritized, and a motor control device in which switching conditions are defined.
Prior art documents
Patent document
Patent document 1 Japanese patent laid-open No. 2003-102193
Disclosure of Invention
Technical problem to be solved by the invention
However, depending on the use of the in-vehicle air conditioner, the motor of the electric compressor may be unintentionally stopped against the instruction due to a factor such as a long duration of a high torque load state or a rapid change in the required rotation speed. An example of this is step loss, but step loss may cause, for example, a spike current to flow in a control circuit of the electric compressor, thereby affecting electronic components in the circuit.
However, the compressor described in patent document 1 has the following problems. That is, the control method and the switching method defined above cannot prevent the motor from stopping when the cause of the step-out occurs. Therefore, depending on the operating conditions, the stop of the motor may prevent the normal operation of the electronic components on the control circuit of the electric compressor or damage the electronic components themselves.
Accordingly, an object of the present invention is to provide a motor control device, an electric compressor, an air conditioner for a mobile body, and a method for controlling an electric compressor, which can solve the above problems.
Means for solving the technical problem
In order to solve the above problem, the present invention adopts the following method. That is, a motor control device is characterized by comprising: a control unit that controls the rotation speed of the motor in accordance with a required rotation speed by performing a 1 st control capable of performing high-torque and precise control of the motor or a 2 nd control capable of performing control of the motor with higher efficiency than the 1 st control; and a switching determination unit that switches from the 1 st control to the 2 nd control when an actual measured rotation speed value of the motor exceeds a predetermined rotation speed threshold value, wherein the switching determination unit further switches from the 1 st control to the 2 nd control when the actual measured rotation speed value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a time point when the actual measured rotation speed value coincides with the required rotation speed.
According to this configuration, for example, step-out can be prevented when switching between the two types of motor control at the time of starting the motor of the electric compressor. For example, the 1 st control is a control that enables high-torque and high-precision operation but is not good at high efficiency and wide-range operation. On the other hand, control that is not good at high torque and high accuracy operation but can perform high efficiency and wide range operation is set as the 2 nd control. In this case, the timing of switching from the 1 st control to the 2 nd control can be relatively advanced. That is, even when a situation in which the above-described step-out may be a factor (continuation of the high torque load state, rapid fluctuation of the required rotation speed, or the like) occurs, the control can be shifted to the 2 nd control capable of the wide-range operation without waiting until the actual rotation speed measurement value of the motor exceeds the predetermined rotation speed threshold value. In addition, even if step-out does not occur in the 1 st control, step-out may occur when switching from the 1 st control to the 2 nd control, but in this case, switching is performed in a state where the required rotation speed and the measured rotation speed have been kept in agreement for a predetermined time, and therefore, the risk of step-out at the time of switching can be reduced. Further, by setting the 1 st control after the start to a shorter period, even when the refrigerant must be compressed under a relatively high pressure such as when the outside air temperature is high, the 2 nd control having excellent efficiency can be preferentially performed, and therefore, overheating of the IGBT (insulated gate bipolar transistor) can be suppressed.
The motor control device may be configured to control the motor as follows: a motor control device is provided with: a control unit that performs a 1 st control or a 2 nd control on a motor and controls a rotation speed of the motor according to a requested rotation speed, the 1 st control being capable of tracking the requested rotation speed or a torque load applied to the motor in a first predetermined time unit, the 2 nd control being capable of tracking the requested rotation speed or the torque load in a second predetermined time unit, a time of the second predetermined time unit being longer than a time of the first predetermined time unit in the 1 st control, and a switching determination unit that switches from the 1 st control to the 2 nd control when a measured rotation speed value of the motor exceeds a predetermined rotation speed threshold value, the switching determination unit further switching the motor to the first control when the measured rotation speed value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a time point at which the measured rotation speed value coincides with the requested rotation speed, switching from the 1 st control to the 2 nd control.
According to this configuration, for example, when the control capable of performing highly accurate control by tracking the fluctuation of the required rotation speed or the torque load applied to the motor in microseconds is the 1 st control and the control capable of tracking in milliseconds is the 2 nd control, the timing of switching from the 1 st control to the 2 nd control can be relatively advanced. That is, even when a situation that may cause the step-out as described above occurs, it is not necessary to switch to the control that is not sensitive to the fluctuation of the required rotation speed until the actual measured rotation speed of the motor exceeds the predetermined rotation speed threshold value, and the motor can be prevented from stopping, such as the step-out.
In the motor control device, the switching determination unit may switch from the 1 st control to the 2 nd control when the variation in the required rotation speed is equal to or greater than a predetermined variation threshold.
According to this configuration, since the change in the required rotation speed, which causes step-out, is directly set as the switching condition, step-out can be more reliably prevented.
Further, the following may be used: the motor control device further includes a torque-related parameter acquiring unit that acquires a parameter related to torque to be output by the motor, and the switching determination unit switches from the 1 st control to the 2 nd control when the torque estimated from the acquired parameter exceeds a torque threshold value.
According to this configuration, since the increase in the torque load that causes step-out is directly used as a condition for switching, step-out can be more reliably prevented.
In the motor control device, the predetermined time may be 1 second.
According to this configuration, the switching can be performed sufficiently earlier than the influence of the required rotation speed or the constant high torque load applied to the motor on the motor control, and therefore, the step-out can be more reliably prevented.
The motor control method according to the present invention is characterized by comprising: controlling the rotation speed of the motor according to the required rotation speed by performing a 1 st control capable of performing high-torque and precise control on the motor or a 2 nd control capable of performing control on the motor with higher efficiency than the 1 st control; and a step of switching from the 1 st control to the 2 nd control when the measured rotation speed value of the motor exceeds a predetermined rotation speed threshold value, wherein in the step of switching to the 2 nd control, the 1 st control is switched to the 2 nd control when the measured rotation speed value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a time point when the measured rotation speed value coincides with the required rotation speed.
The electric compressor according to the present invention is characterized by including the motor control device.
The air conditioner for a mobile object according to the present invention is characterized by comprising the electric compressor.
The motor control program according to the present invention is characterized by causing a computer to execute the motor control method.
Effects of the invention
According to the motor control device, the electric compressor provided with the motor control device, the air conditioner for a moving body, the motor control method, and the motor control program, it is possible to improve the reliability of the motor control device, the electric compressor provided with the motor control device, and the air conditioner for a moving body by preventing the step-out of the motor.
Drawings
Fig. 1 is a schematic block diagram of a vehicle as a mobile unit mounted with an air conditioner including an electric compressor having a motor control device according to a first embodiment of the present invention.
Fig. 2 is a schematic block diagram of an electric compressor including a motor control device according to a first embodiment of the present invention.
Fig. 3 is a flowchart illustrating an example of the motor control according to the first embodiment of the present invention.
Fig. 4 is a flowchart illustrating an example of motor control according to a second embodiment of the present invention.
Fig. 5 is a schematic block diagram of an electric compressor including a motor control device according to a third embodiment of the present invention.
Fig. 6 is a flowchart showing an example of motor control according to a third embodiment of the present invention.
Detailed Description
[ first embodiment ]
A motor control method of an electric compressor according to a first embodiment of the present invention will be described below with reference to fig. 1 to 6.
Fig. 1 is a schematic block diagram of a vehicle 100 as a moving body mounted with an air conditioner 1 including an electric compressor 11 having a motor control device 51 according to a first embodiment of the present invention.
Fig. 1 shows an ECU (electronic Control Unit) 2 mounted on a vehicle 100 and an in-vehicle air conditioner 1. As shown in the figure, the vehicle 100 includes an ECU2 and an air conditioner 1. The air conditioner 1 further includes an electric compressor 11. The ECU2 controls the electric devices of the vehicle 100. The air conditioner 1 is an in-vehicle air conditioning unit. The electric compressor 11 is an electric compressor used for an in-vehicle air conditioner. The electric compressor 11 is an inverter-integrated electric compressor in which the inverter device 41 is integrally assembled. The ECU2 is connected to the air conditioner 1 by a signal line, a communication line, a power line, and the like, and the air conditioner 1 receives a control signal of the ECU2 by CAN (Controller Area Network) communication and performs an operation desired by a user. For example, when the user performs an operation to start the air conditioner operation, the ECU2 outputs a control signal corresponding to the operation to the air conditioner 1, and the air conditioner 1 starts the operation according to the control signal. When the user sets the vehicle interior temperature, the ECU1 generates a control signal corresponding to the set temperature, and controls the operating state of the air conditioner 2.
Fig. 2 is a schematic block diagram of the electric compressor 11 including the motor control device 51 according to the first embodiment of the present invention. The electric compressor 11 is an inverter-integrated electric compressor, and includes an inverter device 41, a motor 12, and a compression unit 10.
The inverter device 41 converts direct-current power supplied from a power source (not shown) such as a battery into three-phase alternating-current power, and supplies the three-phase alternating-current power to the motor 12. The motor 12, which obtains electric power, rotates, and transmits rotational force to the compression part 10, which is mechanically connected to the motor 12. The compression unit 10 that receives the rotational force supplies the refrigerant to a refrigerant circuit (not shown) provided in the air conditioner 1.
The inverter device 41 has a motor control device 51. The motor control device 51 includes a control unit 61 and a switching determination unit 71.
The control unit 61 includes a 1 st control means 611 for performing control 1 and a 2 nd control means 612 for performing control 2. In the present embodiment, the 1 st control means 611 is a means for performing control (referred to as control 1) that is capable of performing high-torque and high-precision operation, but is not good at high-efficiency and wide-range operation. Therefore, the control is suitable for driving the motor 12 at low speed and high torque, and is effective when a particularly large starting torque is required. Therefore, the motor control device 51 according to the present embodiment performs the control 1 when the motor 12 is started. That is, when the user performs an operation to start the air-conditioning operation, the ECU1 outputs a control signal corresponding to the operation to the air conditioner 1, and the air conditioner 1 receives the signal and starts the driving of the motor 12 by the inverter control controlled by the control section 61 using the 1 st control mechanism 611.
Further, since the calculation of the voltage and the like in the control 1 in the present embodiment is performed in microseconds, the required number of revolutions can be tracked with high sensitivity. Therefore, the motor operation can be performed with high accuracy.
On the other hand, in the present embodiment, the 2 nd control means 612 is a means that performs a control (referred to as control 2) that is not good at high torque and high accuracy operation, but can perform a high efficiency and wide range of operation. Further, since the calculation of the control 2 in the present embodiment is performed in units of milliseconds, there is an advantage that the required rotation speed is not tracked with excessive sensitivity and the resistance to a rapid change is strong, so that the operation can be performed efficiently and in a wide range. Therefore, in the motor control device 51 according to the present embodiment, after the motor 12 is started, control 1 is first performed, and then control 2 is switched.
Next, the switching determination unit 71 will be described in detail. The switching determination unit 71 includes a rotation speed measured value calculation means 711.
The switching determination unit 71 in the present embodiment performs determination for switching from control 1 to control 2, and transmits a signal for switching to the control unit 61 when a condition is satisfied. As one of the conditions, when the actual rotation speed measurement value exceeds a predetermined threshold value, the switching determination unit 71 in the present embodiment compares the actual rotation speed measurement value obtained from the actual rotation speed measurement value calculation means 711 with the predetermined threshold value. For example, the predetermined threshold is 2000 rpm. At this time, the control is forcibly switched regardless of other conditions. That is, when the rotation speed of the motor 12 becomes equal to or higher than the predetermined threshold value after the user starts operating the air conditioner, the switching determination unit 71 instructs the control unit 61 to switch to the control 2, and the control unit 61 drives the electric compressor by the control 2 in accordance with the instruction.
As described above, the motor control device 51 according to the present embodiment can operate the electric compressor by effectively driving the motor while obtaining a desired operational effect by performing the control and the switching thereof using the respective advantages of the two controls.
Here, the switching determination unit 71 according to the present embodiment has a condition for switching even when the actually measured value of the rotation speed is equal to or less than the predetermined threshold value. Specifically, the switching is also performed when a predetermined time has elapsed from the time point when the required rotation speed (rotation speed corresponding to the frequency of the electric power supplied to the motor 12) coincides with the rotation speed actual measurement value obtained from the rotation speed actual measurement value calculation means 711.
The predetermined time is, for example, 1 second.
Next, a flow of control switching in the motor control device 51 of the electric compressor according to the present embodiment will be described.
Fig. 4 is a flowchart illustrating an example of control switching in the motor control device 51 of the electric compressor according to the embodiment of the present invention.
First, the determination unit compares the rotation speed measured value obtained from the rotation speed measured value calculation means 711 with a predetermined threshold value (step S13), and if the rotation speed measured value exceeds the predetermined threshold value (step S13; y), the control 2 is forcibly executed (step S14). On the other hand, if the rotation speed does not exceed the required rotation speed (step S13; n), the determination unit then determines whether or not the rotation speed measured value matches the required rotation speed (step S15). If not (step S15; YES), control 1 is executed (step S16). When the detected rotation speed coincides with the required rotation speed (step S15; y), the determination unit compares the time during which the measured rotation speed and the required rotation speed coincide with each other with a predetermined time (step S17). If the time for which the comparison is made does not exceed the predetermined time (step S17; n), control 1 is continued (step S18). When the determination result exceeds (step S17; YES), control 2 is executed (step S19).
In the motor control device 51 configured as described above, when switching from control 1 to control 2 is performed, if the actual measured rotation speed value matches the requested rotation speed within a predetermined time, control 2 is executed even if the threshold value determined by the rotation speed is not exceeded. This can prevent step-out when the two motor control methods are switched, for example, when the motor 12 of the electric compressor is started. In the present embodiment, the timing of switching from the control 1, which is capable of performing high-torque and high-precision operation but is not good at high-efficiency and wide-range operation, to the control 2, which is not good at high-torque and high-precision operation but capable of performing high-efficiency and wide-range operation, can be made relatively early. That is, even when there is a factor of step-out (such as a constant increase in torque load or a rapid change in required rotational speed) as described above, it is possible to shift to the control 2 which is insensitive to a change in required rotational speed and enables a wide-range operation without waiting until the actual measured value of the rotational speed of the motor 12 exceeds a predetermined rotational speed threshold value. In addition, even if step-out does not occur when control 1 is performed, step-out may occur when switching from control 1 to control 2, but in this case, switching is performed in a state where the required rotational speed and the measured rotational speed have been kept in agreement for a predetermined time, and therefore, the risk of step-out at the time of switching can be reduced. This can suppress an adverse effect on the control circuit due to the occurrence of a spike current or the like. Further, by performing control 1 after startup in a shorter period of time, even when the refrigerant must be compressed at a relatively high pressure such as when the outside air temperature is high, control 2 having excellent efficiency can be performed preferentially, and thus overheating of the IGBT can be suppressed.
Therefore, the motor control device 51 according to the present embodiment, the electric compressor 11 provided with the motor control device, and the air conditioner 1 for mobile use can achieve higher reliability.
[ second embodiment ]
Next, a second embodiment will be explained. In the second embodiment, different processing is performed using the same constituent elements as those of the first embodiment. Next, a flow of control switching in the motor control device 52 of the electric compressor according to the present embodiment will be described with reference to fig. 4.
In the present embodiment, the processing performed by the switching determination unit 72 is different from that of the first embodiment. Specifically, as a previous stage of the rotation speed actual measurement value calculation means 711 provided in the use switching determination unit 72, the variation of the requested rotation speed is tracked, and the variation width per hour is compared with a predetermined threshold value (step S21). As a result, when the fluctuation width of the required rotation speed is larger than the predetermined threshold value, the control is switched to the control 2 without using the rotation speed actual measurement value calculation means 711 (step S21; yes). On the other hand, if the measured value is smaller than the predetermined threshold value (step S21; n), the measured value of the rotational speed is compared with the predetermined threshold value using the rotational speed measured value calculation means 711 (step S23). The flow of the subsequent steps, i.e., steps S23 to S29, is the same as the flow of the first embodiment, i.e., steps S13 to S19. In the present embodiment, for example, after reaching steps S24, S26, and S28, the process returns to step S23 corresponding to step S13 in the first embodiment, but the process may return to step S21.
In the motor control device 52 having the above configuration, when the required rotation speed abruptly changes, regardless of the actual rotation speed measurement value, the switching can be made to the control 2 when the switching is made from the control 1 to the control 2. That is, the change in the required rotation speed, which causes step-out, is directly set as the switching condition.
For example, in the same manner as in the first embodiment, when the control 1 is a control that can perform a high-torque and high-precision operation but is not good at a high-efficiency and wide-range operation, and the control 2 is a control that can perform a high-efficiency and wide-range operation but is not good at a high-torque and high-precision operation, if the required rotation speed rapidly fluctuates when the control 1 is performed, the required rotation speed is to be tracked very finely, and as a result, the possibility of step-out is increased. Therefore, by detecting a rapid change in the required rotation speed and switching to the control 2 in accordance with the detection result, it is possible to suppress the occurrence of step-out. This can prevent step-out of the motor 12. This can suppress an adverse effect on the control circuit due to the occurrence of a spike current or the like.
Therefore, the motor control device 52 according to the present embodiment, and the electric compressor 12 and the air conditioner for mobile 2 each including the motor control device can achieve higher reliability.
[ third embodiment ]
Next, a third embodiment of the present invention will be described with reference to fig. 6. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The third embodiment is different from the first embodiment in the configuration of the switching determination unit 73. In the present embodiment, the switching determination unit 73 further includes a torque-related parameter acquisition unit.
The torque-related parameter acquisition section acquires a parameter having a correlation with the torque generated by the motor 12. In the present embodiment, for example, a value of the current of the motor 12 is acquired and a value of the torque of the motor 12 is estimated.
In the present embodiment, as in the second embodiment, the process performed by the switching determination unit 73 is different from that of the first embodiment. Specifically, as a previous stage of using the rotation speed actual measurement value calculation means 711 provided in the switching determination unit 73, when the estimated torque value calculated by the torque-related parameter acquisition unit 83 exceeds a predetermined threshold value, the control is switched to the control 2.
Next, a flow of control switching in the motor control device 53 of the electric compressor according to the present embodiment will be described with reference to fig. 4.
In the present embodiment, the processing performed by the switching determination unit 71 is different from that in the first and second embodiments. Specifically, as a previous stage of using the rotation speed actual measurement value calculation means 711 provided in the switching determination unit 71, the estimated torque value calculated by the torque-related parameter acquisition unit is compared with a predetermined threshold value (step S31). As a result, when the estimated torque value is larger than the predetermined threshold value, the control is switched to the control 2 without using the rotation speed actual measurement value calculation means 711 (step S31; "yes"). On the other hand, if the measured value is smaller than the predetermined threshold value (step S31; n), the measured value of the rotational speed is compared with the predetermined threshold value using the rotational speed measured value calculation means 711 (step S33). The sequence after this is the same as that of the first embodiment. The flow of the subsequent steps, i.e., steps S33 to S39, is the same as the flow of the first embodiment, i.e., steps S13 to S19. In the present embodiment, for example, after reaching steps S34, S36, and S38, the process returns to step S33 corresponding to step S13 in the first embodiment, but the process may return to step S31.
In the motor control device 53 having the above configuration, when switching from control 1 to control 2 is performed, it is possible to switch to control 2 when it is estimated that a high torque is output from the motor 12 regardless of the actual rotation speed measurement value. That is, an increase in the torque load that causes step-out is directly set as a condition for switching.
For example, in the same manner as in the first embodiment, when the control 1 is a control that enables a high-torque and high-accuracy operation but is not good at a high-efficiency and wide-range operation, and the control 2 is a control that is not good at a high-torque and high-accuracy operation but is capable of a high-efficiency and wide-range operation, it is possible to switch to the control 2 that enables a wider-range control in advance. Generally, control 1 is control capable of outputting higher torque than control 2. However, when the vehicle air conditioner is started in a state where the outside air temperature is abnormally high, a state where high torque should be output may become constant. At this time, if control 1 is continued for a long time, step-out may occur. Therefore, although the torque output is reduced by switching to control 2 in advance, adverse effects on the control circuit due to the occurrence of a spike current or the like can be suppressed.
Therefore, the motor control device 53 according to the present embodiment, and the electric compressor 13 and the air conditioner for mobile 3 each including the motor control device can achieve higher reliability.
In any of the above embodiments, the specific control method may be any method, but as an example of the first control (control 1), sensorless vector control may be given, and as an example of the second control (control 2), V/f control may be given.
The motor controllers 51 and 53 and the electric compressors 11 and 13 of the present embodiment can be applied to air conditioning of a refrigerator/freezer vehicle, although the motor compressors 11 and 13 are described as an example of a case where the motor compressors 11 and 13 constitute a part of an in-vehicle air conditioner of the vehicle 100. The motor control devices 51 and 53 and the electric compressor 11 according to the present embodiment may be applied to air conditioners mounted on various moving bodies such as ships, airplanes, and railways, in addition to vehicles.
Industrial applicability
According to the motor control device, the electric compressor provided with the motor control device, the air conditioner for a moving body, the motor control method, and the motor control program, it is possible to improve the reliability of the motor control device, the electric compressor provided with the motor control device, and the air conditioner for a moving body by preventing the step-out of the motor.
Description of the symbols
2-ECU, 1, 3-air conditioner, 100-vehicle, 11-electric compressor, 41, 43-inverter device, 10-compression unit, 12-motor, 51, 53-motor control device, 61-control unit, 71, 73-switching determination unit, 611-1 st control unit, 612-2 nd control unit, 711-rotation speed actual measurement value calculation unit, 83-torque related parameter acquisition unit.
Claims (9)
1. A motor control device is provided with:
a control unit that controls the rotation speed of the motor in accordance with a required rotation speed by performing a 1 st control capable of performing high-torque and precise control of the motor or a 2 nd control capable of performing control of the motor with higher efficiency than the 1 st control; and
a switching determination unit that switches from the 1 st control to the 2 nd control when an actual measured value of the rotation speed of the motor exceeds a predetermined rotation speed threshold value,
the switching determination unit further switches from the 1 st control to the 2 nd control when the rotation speed measured value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a time point at which the rotation speed measured value matches the required rotation speed.
2. A motor control device is provided with:
a control unit that controls the rotation speed of the motor in accordance with a requested rotation speed by performing a 1 st control or a 2 nd control on the motor, the 1 st control being capable of tracking the requested rotation speed or a torque load applied to the motor in a first predetermined time unit, the 2 nd control being capable of tracking the requested rotation speed or the torque load in a second predetermined time unit, the second predetermined time unit being longer than the first predetermined time unit in the 1 st control, and
a switching determination unit that switches from the 1 st control to the 2 nd control when an actual measured value of the rotation speed of the motor exceeds a predetermined rotation speed threshold value,
the switching determination unit further switches from the 1 st control to the 2 nd control when the rotation speed measured value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a time point at which the rotation speed measured value matches the required rotation speed.
3. The motor control device according to claim 1 or 2,
the switching determination unit further switches from the 1 st control to the 2 nd control when the variation in the required rotation speed is equal to or greater than a predetermined variation threshold.
4. The motor control device according to claim 1 or 2, further comprising:
a torque-related parameter acquiring unit that acquires a parameter related to a torque to be output by the motor,
the switching determination unit switches from the 1 st control to the 2 nd control when the torque estimated from the acquired parameter exceeds a torque threshold.
5. The motor control apparatus according to any one of claims 1 to 4,
the predetermined time is 1 second.
6. A motor control method, comprising:
controlling the rotation speed of the motor according to the required rotation speed by performing a 1 st control capable of performing high-torque and precise control on the motor or a 2 nd control capable of performing control on the motor with higher efficiency than the 1 st control; and
a step of switching from the 1 st control to the 2 nd control when the measured value of the rotation speed of the motor exceeds a predetermined rotation speed threshold value,
in the step of switching to the 2 nd control, the 1 st control is switched to the 2 nd control when the rotation speed measured value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a time point when the rotation speed measured value matches the required rotation speed.
7. An electric compressor provided with the motor control device according to any one of claims 1 to 4.
8. An air conditioner for a mobile body, comprising an electric compressor provided with the motor control device according to any one of claims 1 to 4.
9. A program that causes a computer to execute the motor control method of claim 6.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-222638 | 2017-11-20 | ||
| JP2017222638A JP7044523B2 (en) | 2017-11-20 | 2017-11-20 | Motor control device and electric compressor equipped with it, air conditioner for moving body, motor control method and motor control program |
| PCT/JP2018/039425 WO2019097965A1 (en) | 2017-11-20 | 2018-10-24 | Motor control device, electric compressor equipped with same, air-conditioner for moving body, motor control method, and motor control program |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111357191A true CN111357191A (en) | 2020-06-30 |
| CN111357191B CN111357191B (en) | 2023-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201880069379.8A Active CN111357191B (en) | 2017-11-20 | 2018-10-24 | Motor control device, motor control method, electric compressor, and air conditioner for moving object |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11418136B2 (en) |
| JP (1) | JP7044523B2 (en) |
| CN (1) | CN111357191B (en) |
| DE (1) | DE112018005917T5 (en) |
| WO (1) | WO2019097965A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6856164B2 (en) | 2019-09-30 | 2021-04-07 | ダイキン工業株式会社 | Motor drive method and motor drive device |
| AU2020380962B2 (en) * | 2019-11-08 | 2023-11-02 | Milwaukee Electric Tool Corporation | Motor control for gas engine replacement device |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20200313582A1 (en) | 2020-10-01 |
| JP7044523B2 (en) | 2022-03-30 |
| US11418136B2 (en) | 2022-08-16 |
| DE112018005917T5 (en) | 2020-08-06 |
| WO2019097965A1 (en) | 2019-05-23 |
| JP2019097244A (en) | 2019-06-20 |
| CN111357191B (en) | 2023-12-26 |
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